File:Gibbous-Crescent-half-ellipse-in-circle-outlined.svg
Original file (SVG file, nominally 612 × 612 pixels, file size: 604 bytes)
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Summary
[edit]DescriptionGibbous-Crescent-half-ellipse-in-circle-outlined.svg | A circle divided into a gibbous shape (left) and an astronomical crescent shape (right) by a half-ellipse, where the major axis of the ellipse coincides with a diameter of the circle. According to geometry, an illuminated hemisphere of a sphere will appear to take on such gibbous or crescent shapes when viewed from an angle. In this case, the length of the major axis of the ellipse is twice the length of the minor axis (i.e. the eccentricity is half the square root of 3), so that the larger gibbous area shows the theoretical shape of the visible lit area of the moon (for example) when the separation between the viewing angle and the angle of illumination (i.e. between Earth and Sun) is 60 degrees, while the smaller crescent area shows the theoretical shape of the visible lit area of a sphere when the separation between the viewing angle and the angle of illumination is 120 degrees. |
Date | (PNG image and PostScript source code 2005) |
Source |
SVG version of Image:Gibbous-Crescent-half-ellipse-in-circle-outlined.png %! 3 setlinewidth 300 156 144 0 360 arc gsave 1 setgray fill grestore stroke 300 12 moveto 39.765 0 72 64.471 72 144 rcurveto 0 79.529 -32.235 144 -72 144 rcurveto stroke showpage %%EOF |
Author | First SVG file uploaded by User:Ttog~commonswiki based on PNG image by AnonMoos |
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SVG development InfoField | This vector image was created with a text editor. |
Licensing
[edit]Public domainPublic domainfalsefalse |
This work has been released into the public domain by its author, AnonMoos. This applies worldwide. In some countries this may not be legally possible; if so: |
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:01, 15 February 2013 | 612 × 612 (604 bytes) | AnonMoos (talk | contribs) | adding XMLNS header to avoid future problems, simplifying, slight improvement in exactness | |
10:36, 14 February 2010 | 612 × 612 (622 bytes) | AnonMoos (talk | contribs) | opaque only within circle | ||
12:27, 18 December 2006 | 612 × 612 (682 bytes) | AnonMoos (talk | contribs) | adding white background | ||
02:12, 3 July 2006 | 612 × 612 (598 bytes) | AnonMoos (talk | contribs) | compact exact PS conversion with margins | ||
10:25, 16 June 2006 | 510 × 510 (2 KB) | Ttog~commonswiki (talk | contribs) | transparent | ||
10:23, 16 June 2006 | 500 × 500 (2 KB) | Ttog~commonswiki (talk | contribs) | == Summary == A circle divided into a gibbous shape (left) and an astronomical crescent shape (right) by a half-ellipse, where the major axis of the ellipse coincides with a diameter of the circle. According to geometry, an illuminated hemisphere of a sp |
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Short title | Moon Gibbous/Crescent shapes (outlined version) - circle divided by half-ellipse whose major axis is the diameter of the circle, and whose minor axis is half the major axis. |
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Width | 612 |
Height | 612 |